[jdk11u-dev] RFR: 8261846: [JVMCI] c2v_iterateFrames can get out of sync with the StackFrameStream

[Severin Gehwolf]

This is a JVMCI related backport for OpenJDK 11. It fixes an issue of a fastdebug JVM asserting when running an upstream graal unit test. Applies clean.

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Commit messages:
 - Backport 97e1657ba2424f253cd9a9b51cc7749c72f9b268

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/288/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=288&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8261846
  Stats: 14 lines in 3 files changed: 9 ins; 0 del; 5 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/288.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/288/head:pull/288

PR: https://git.openjdk.java.net/jdk11u-dev/pull/288